摘要
安徽泾县—南陵地区二叠系较发育,主要由碳酸盐岩、硅质岩和碎屑岩组成。二叠系船山组为浅水碳酸盐台地相;栖霞组底部碎屑岩段是滨海沼泽相,臭灰岩段和上、下富硅质灰岩段是水体较深的斜坡中部相,中部灰岩段是浅水开阔碳酸盐台地相,而顶部灰岩段是缓斜坡上部相;孤峰组和大隆组是缺氧滞流环境下的深水盆地至盆地边缘相;武穴组是碳酸盐台地相,银屏组属于滨海潟湖相;龙潭组是一套海陆交互的三角洲相沉积,包括从三角洲前缘到三角洲平原两个亚相,而泾县昌桥龙潭组顶部发育的生物碎屑灰岩属于开阔碳酸盐台地相。纵观二叠纪有三次大的海侵和两次大的海退旋回,海侵时间分别是:栖霞早期、茅口早期和长兴早期,海退时间分别是:紫松—隆林期末和茅口期末,其中栖霞期还包含两个海侵海退的亚旋回。
The Permian of the Jingxian and Nanling regions in Anhui Province are well developed, mainly consisting of carbonate, siliceous rocks, and siliciclastic. The Permian Chuanshan Formation belongs to shallow carbonate platform facies. In the Chihsia Formation, the basal siliciclastic member belongs to littoral swamp facies, the fetid limestone member, the lower and upper siliceons. limestone members were deposited in the middle part of carbonate slope, the middle limestone member belongs to shallow open carbonate platform, and the uppermost limestone member was deposited in the upper slopefacies. The Gufeng and Dalong Formations were deposited in anoxic environments in deep basinar to basin marginfacies. The Wuxue Formation was deposited in carbonate platformfacies, and the Yinping Formation belongs to littoral lagoon facies. The Longtan Formation with interbedded marine and nanmarina units was deposited, mostly in delta environments,including om delta front facies and delta plain facies, and the bioclastic limetone of the uppermost Longtan Formation in Jingxian belongs to open carbonate platform facies. The Permian strata recon three transgression and two regression cycles, with transgressions occurring in the early Qixian, early Maokouan and early Changxingian Stages, and regressions in the temihal Chuanshanan and teminal Maokouan Stages. At afiner scale the Qixia Stage includes two transgression and regression sub-cycles.
出处
《地层学杂志》
CSCD
北大核心
2010年第4期431-444,共14页
Journal of Stratigraphy
基金
安徽省自然科学基金项目(No.070415205)
国家自然科学基金项目(No.40972082
40572076)
中国石油化工股份有限公司项目(中上扬子及邻区古生代古沉积环境演化研究)联合资助
关键词
沉积相
沉积环境
二叠系
泾县
南陵
安徽
sedimentary facies
depositional environment
Permian
Jingxian
nanling
Anhui
